冷轧或冷拔无缝钢铁精准

precision steel pipe pipe seamless steel pipe Used the high precision cold rolling bench to product tubes, with complete checking equipments. Consistent with DIN2391/EN10305/ASTM A519, used quality raw materials and reasonable production processes. Advantages: high precision size, high consistency, well roughness surface, excellent mechanical properties. Widely used in follow industries: hydraulic cylinder, construction machinery, electrical components, automobile or motorcycle's parts, concrete pump tubes, pipe core for aluminum foil, motor shell and so on. Chemical composition(%) of precision pipe’s common grades Standard Grade Chemical composition(%)C Si Mn S P Cr GB/T699 GB/T3639-2000 GB3077-88 10# 0.07 0.13 0.17 0.37 0.35 0.65 ≤0.035 ≤0.035 20# 0.17 0.23 0.17 0.37 0.35 0.65 ≤0.035 ≤0.035 35# 0.32 0.39 0.17 0.37 0.35 0.65 ≤0.035 ≤0.035 45# 0.42 0.50 0.17 0.37 0.50 0.80 ≤0.035 ≤0.035 40cr 0.37 0.44 0.17 0.37 0.50 0.80 ≤0.035 ≤0.035 0.08 1.10 25Mn 0.22 0.29 0.17 0.37 0.70 1.00 ≤0.035 ≤0.035 ≤0.25 37Mn5 0.30 0.39 0.15 0.30 1.20 1.50 ≤0.015 ≤0.020 Conventional mechanical properties of precision pipe StandardGrade Delivery Conditions BK BKW Tensile stengthσb(MPa) Make percentage elongationδ5(%) Tensile stengthσb(MPa) Make prcentage elongationδ5(%) GB/T3639-2000 GB3077-88 10# ≥410 ≥6 ≥375 ≥10 20# ≥510 ≥5 ≥450 ≥8 35# ≥590 ≥4 ≥550 ≥6 45# ≥645 ≥4 ≥630 ≥5 40cr ≥784 ≥12 37Mn5 ≥784 ≥12